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taddhitAH तद्धिताः ONPANINI 41076

The /taddhita (are described next).

/adhikAra, valid from here at 41076 (we just started book 4) up to the end of book five.

The /taddhita affixes are those that are added to a nounbase to make another nounbase.

As for instance, the word sUryaH सूर्यः "sun" comes from the nounbase sUrya- सूर्यॱ. Adding the /taddhita affix /aN'' to this base we get the nounbase saurya- सौर्यॱ, which in turn makes the word sauryaH सौर्यः "solar" —

sUrya सूर्य + /su → !**sUryas सूर्यस् "sun"

sUrya- सूर्यॱ + /aN''
→ saurya- सौर्यॱ + a- अॱ by taddhiteSvac...
→ saury- सौर्य् + a अ by atoguNe
→ !**saurya- सौर्यॱ "solar"

saurya सौर्य + /su → !**sauryas सौर्यस् "solar"